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NCERT Class XII Chapter
Nuclei
Questions With Solutions

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Question : 2
Total: 31
The three stable isotopes of neon :
20
‌
10
Ne ,
21
‌
10
Ne and
22
‌
10
 Ne have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.
Solution:  
Average atomic mass of neon with the given abundances,
A =
90.51(19.99u)+0.27(20.99u)+9.22(21.99u)
100
 =
2017.7
100
u = 20.18 u
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